Keith. The video was made 12 years ago.
High capacitance and low inductance is mandatory for speaker cable to get square root L/C near 8 ohms to eliminate reflections. see
https://www.allaboutcircuits.com/textbook/alternating-current/chpt-14/characteristic-impedance/
SIY It doesn't matter if the PAIR of wires are coiled or not, as there is no net external field, electric or magnetic. The results are identical if coiled or uncoiled. Try it yourself.
Keith. See above. Also, square waves are quite good for analysing the dynamic performance of electrical circuits.
Amir All wires are 10 metres in length, except for the long coil of Monster. The short one is 10m.
Solderdude. The spikes are due to to multiple reflections giving the appearance of rolloff. The results when playing music are shown here
I will be posting a video soon where you can listen to the difference. Quite alarming!
We modelled the class AB transistor amplifier and found it to be stable with zero capacitance and 2 microfarads, but maximum instability with about 10 nanofarads. When my colleague Jack Dinsdale designed the first transformerless transistor amplifier he observed this and so he included the 3 microhenry inductor in series with the output to compensate for this to make the class AB amplifier unconditionally stable. In the 70s, John Farlow of Exposure Elecronics left this inductor out of his designs to make sure you used his widely spaced, high inductance, low capacitance cable for marketing purposes. 3. 5 metres of Exposure/Naim/TQ/DNM etc cable provides the 3 microhenries to stabilise the amplifier. He taught Julian Verica of Naim this trick, hence the proliferation of widely spaced cables with these conditionally stable amplifiers. To allow the use of our high capacitance/low inductance cable (sq rt L/C=8R) with these amplifiers. It works!
Amirm. Yes, the Lodestar AG02601a has a rise time of 0.5 microseconds, but what you have conveniently avoided observing is that the signal is passing through a severely band-limited, normal Cambridge Audio amplifier. The distortion is clearly audible!
Thomas Savage Typical flat-earther comment.
Max Townshend B.E. (Communications)